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router_controller.go
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router_controller.go
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package controller
import (
"fmt"
"sync"
"time"
"github.com/golang/glog"
"k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
utilwait "k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/apis/extensions"
projectclient "github.com/openshift/origin/pkg/project/generated/internalclientset/typed/project/internalversion"
routeapi "github.com/openshift/origin/pkg/route/apis/route"
"github.com/openshift/origin/pkg/router"
)
// RouterController abstracts the details of watching resources like Routes, Endpoints, etc.
// used by the plugin implementation.
type RouterController struct {
lock sync.Mutex
Plugin router.Plugin
firstSyncDone bool
FilteredNamespaceNames sets.String
NamespaceLabels labels.Selector
// Holds Namespace --> RouteName --> RouteObject
NamespaceRoutes map[string]map[string]*routeapi.Route
// Holds Namespace --> EndpointsName --> EndpointsObject
NamespaceEndpoints map[string]map[string]*kapi.Endpoints
ProjectClient projectclient.ProjectResourceInterface
ProjectLabels labels.Selector
ProjectSyncInterval time.Duration
ProjectWaitInterval time.Duration
ProjectRetries int
WatchNodes bool
EnableIngress bool
IngressTranslator *IngressTranslator
}
// Run begins watching and syncing.
func (c *RouterController) Run() {
glog.V(4).Info("Running router controller")
if c.ProjectLabels != nil {
c.HandleProjects()
go utilwait.Forever(c.HandleProjects, c.ProjectSyncInterval)
}
c.handleFirstSync()
}
func (c *RouterController) HandleProjects() {
for i := 0; i < c.ProjectRetries; i++ {
names, err := c.GetFilteredProjectNames()
if err == nil {
// Return early if there is no new change
if names.Equal(c.FilteredNamespaceNames) {
return
}
c.lock.Lock()
defer c.lock.Unlock()
c.FilteredNamespaceNames = names
c.UpdateNamespaces()
c.Commit()
return
}
utilruntime.HandleError(fmt.Errorf("unable to get filtered projects for router: %v", err))
time.Sleep(c.ProjectWaitInterval)
}
glog.V(4).Infof("Unable to update list of filtered projects")
}
func (c *RouterController) GetFilteredProjectNames() (sets.String, error) {
names := sets.String{}
all, err := c.ProjectClient.List(v1.ListOptions{LabelSelector: c.ProjectLabels.String()})
if err != nil {
return nil, err
}
for _, item := range all.Items {
names.Insert(item.Name)
}
return names, nil
}
func (c *RouterController) processNamespace(eventType watch.EventType, ns *kapi.Namespace) {
before := c.FilteredNamespaceNames.Has(ns.Name)
switch eventType {
case watch.Added, watch.Modified:
if c.NamespaceLabels.Matches(labels.Set(ns.Labels)) {
c.FilteredNamespaceNames.Insert(ns.Name)
} else {
c.FilteredNamespaceNames.Delete(ns.Name)
}
case watch.Deleted:
c.FilteredNamespaceNames.Delete(ns.Name)
}
after := c.FilteredNamespaceNames.Has(ns.Name)
// Namespace added or deleted
if (!before && after) || (before && !after) {
glog.V(5).Infof("Processing matched namespace: %s with labels: %v", ns.Name, ns.Labels)
c.UpdateNamespaces()
// New namespace created or router matching labels added to existing namespace
// Routes for new namespace will be handled by HandleRoute().
// For existing namespace, add corresponding endpoints/routes as watch endpoints
// and routes won't be updated till the next resync interval which could be few mins.
if !before && after {
if epMap, ok := c.NamespaceEndpoints[ns.Name]; ok {
for _, ep := range epMap {
if err := c.Plugin.HandleEndpoints(watch.Modified, ep); err != nil {
utilruntime.HandleError(err)
}
}
}
if routeMap, ok := c.NamespaceRoutes[ns.Name]; ok {
for _, route := range routeMap {
c.processRoute(watch.Modified, route)
}
}
}
}
}
func (c *RouterController) UpdateNamespaces() {
namespaces := c.FilteredNamespaceNames
// The ingress translator synchronizes access to its cache with a
// lock, so calls to it are made outside of the controller lock to
// avoid unintended interaction.
if c.EnableIngress {
c.IngressTranslator.UpdateNamespaces(namespaces)
}
glog.V(4).Infof("Updating watched namespaces: %v", namespaces)
if err := c.Plugin.HandleNamespaces(namespaces); err != nil {
utilruntime.HandleError(err)
}
}
func (c *RouterController) RecordNamespaceEndpoints(eventType watch.EventType, ep *kapi.Endpoints) {
switch eventType {
case watch.Added, watch.Modified:
if _, ok := c.NamespaceEndpoints[ep.Namespace]; !ok {
c.NamespaceEndpoints[ep.Namespace] = make(map[string]*kapi.Endpoints)
}
c.NamespaceEndpoints[ep.Namespace][ep.Name] = ep
case watch.Deleted:
if _, ok := c.NamespaceEndpoints[ep.Namespace]; ok {
delete(c.NamespaceEndpoints[ep.Namespace], ep.Name)
if len(c.NamespaceEndpoints[ep.Namespace]) == 0 {
delete(c.NamespaceEndpoints, ep.Namespace)
}
}
}
}
func (c *RouterController) RecordNamespaceRoutes(eventType watch.EventType, rt *routeapi.Route) {
switch eventType {
case watch.Added, watch.Modified:
if _, ok := c.NamespaceRoutes[rt.Namespace]; !ok {
c.NamespaceRoutes[rt.Namespace] = make(map[string]*routeapi.Route)
}
c.NamespaceRoutes[rt.Namespace][rt.Name] = rt
case watch.Deleted:
if _, ok := c.NamespaceRoutes[rt.Namespace]; ok {
delete(c.NamespaceRoutes[rt.Namespace], rt.Name)
if len(c.NamespaceRoutes[rt.Namespace]) == 0 {
delete(c.NamespaceRoutes, rt.Namespace)
}
}
}
}
func (c *RouterController) HandleNamespace(eventType watch.EventType, obj interface{}) {
ns := obj.(*kapi.Namespace)
c.lock.Lock()
defer c.lock.Unlock()
glog.V(4).Infof("Processing Namespace: %s", ns.Name)
glog.V(4).Infof(" Event: %s", eventType)
c.processNamespace(eventType, ns)
c.Commit()
}
// HandleNode handles a single Node event and synchronizes the router backend
func (c *RouterController) HandleNode(eventType watch.EventType, obj interface{}) {
node := obj.(*kapi.Node)
c.lock.Lock()
defer c.lock.Unlock()
glog.V(4).Infof("Processing Node: %s", node.Name)
glog.V(4).Infof(" Event: %s", eventType)
if err := c.Plugin.HandleNode(eventType, node); err != nil {
utilruntime.HandleError(err)
}
}
// HandleRoute handles a single Route event and synchronizes the router backend.
func (c *RouterController) HandleRoute(eventType watch.EventType, obj interface{}) {
route := obj.(*routeapi.Route)
c.lock.Lock()
defer c.lock.Unlock()
c.processRoute(eventType, route)
c.Commit()
}
// HandleEndpoints handles a single Endpoints event and refreshes the router backend.
func (c *RouterController) HandleEndpoints(eventType watch.EventType, obj interface{}) {
endpoints := obj.(*kapi.Endpoints)
c.lock.Lock()
defer c.lock.Unlock()
c.RecordNamespaceEndpoints(eventType, endpoints)
if err := c.Plugin.HandleEndpoints(eventType, endpoints); err != nil {
utilruntime.HandleError(err)
}
c.Commit()
}
// HandleIngress handles a single Ingress event and synchronizes the router backend.
func (c *RouterController) HandleIngress(eventType watch.EventType, obj interface{}) {
ingress := obj.(*extensions.Ingress)
// The ingress translator synchronizes access to its cache with a
// lock, so calls to it are made outside of the controller lock to
// avoid unintended interaction.
events := c.IngressTranslator.TranslateIngressEvent(eventType, ingress)
c.lock.Lock()
defer c.lock.Unlock()
c.processIngressEvents(events)
c.Commit()
}
// HandleSecret handles a single Secret event and synchronizes the router backend.
func (c *RouterController) HandleSecret(eventType watch.EventType, obj interface{}) {
secret := obj.(*kapi.Secret)
// The ingress translator synchronizes access to its cache with a
// lock, so calls to it are made outside of the controller lock to
// avoid unintended interaction.
events := c.IngressTranslator.TranslateSecretEvent(eventType, secret)
c.lock.Lock()
defer c.lock.Unlock()
c.processIngressEvents(events)
c.Commit()
}
// Commit notifies the plugin that it is safe to commit state.
func (c *RouterController) Commit() {
if c.firstSyncDone {
if err := c.Plugin.Commit(); err != nil {
utilruntime.HandleError(err)
}
}
}
// processRoute logs and propagates a route event to the plugin
func (c *RouterController) processRoute(eventType watch.EventType, route *routeapi.Route) {
glog.V(4).Infof("Processing Route: %s/%s -> %s", route.Namespace, route.Name, route.Spec.To.Name)
glog.V(4).Infof(" Alias: %s", route.Spec.Host)
glog.V(4).Infof(" Path: %s", route.Spec.Path)
glog.V(4).Infof(" Event: %s", eventType)
c.RecordNamespaceRoutes(eventType, route)
if err := c.Plugin.HandleRoute(eventType, route); err != nil {
utilruntime.HandleError(err)
}
}
// processIngressEvents logs and propagates the route events resulting from an ingress or secret event
func (c *RouterController) processIngressEvents(events []ingressRouteEvents) {
for _, ingressEvent := range events {
glog.V(4).Infof("Processing Ingress: %s", ingressEvent.ingressKey)
for _, routeEvent := range ingressEvent.routeEvents {
c.processRoute(routeEvent.eventType, routeEvent.route)
}
}
}
func (c *RouterController) handleFirstSync() {
c.lock.Lock()
defer c.lock.Unlock()
c.firstSyncDone = true
glog.V(4).Infof("Router first sync complete")
c.Commit()
}